<!DOCTYPE html>
<html>
<head>
	<title>柱状图</title>
	<style type="text/css">
		svg{
			border: 1px solid #333;
		}
	</style>
</head>
<body>
	<svg width="600" height="400">
		
		<rect x="0" y="40" width="200" height="50" fill="tomato" />
		<rect x="0" y="130" width="240" height="50" fill="tomato" />
		<rect x="0" y="220" width="320" height="50" fill="tomato" />
		<rect x="0" y="310" width="160" height="50" fill="tomato" />	
	</svg>
</body>
</html>